TW200844030A - Sheet-conveying apparatus and method for detection of multiple documents thereof - Google Patents

Abstract

A sheet-conveying apparatus and method for detection of multiple documents thereof are provided. The sheet-conveying apparatus includes a passageway, a sheet-transporting mechanism and a sheet-detecting device. The sheet-detecting device disposed on the passageway comprises a first transmitter, a first receiver, a second transmitter, and a second receiver. The signal from the first transmitter is emitted along a first emitting path and received by the first receiver. The signal from the second transmitter is emitted along a second emitting path and received by the second receiver. The second emitting path is not parallel to the first emitting path. The sheet-detecting device further comprises an analysis unit for determining if multiple sheets are conveyed in the sheet-conveying apparatus based on the variations of the first signal and the second signal respectively received by the first receiver and the second receiver.

Description

.200844030

达达编号号: TW3490PA IX. Description of the Invention: [Technical Field] The present invention relates to a paper feeding device, and more particularly to a paper feeding device capable of detecting a plurality of sheets and a detecting method thereof. [Prior Art] Most of today's electronic products such as scanners, photocopiers, or multifunction printers are provided with paper feeding devices to automatically feed the entire stack of documents to be processed into electronic devices for further scanning and photocopying. Or print and other functions. Technically, although the paper feeding device can feed the entire stack of documents or paper one by one into the electronic device, the condition of multiple sheets cannot be avoided during the paper feeding process. If two (or more) files are fed simultaneously while scanning a full stack of files, some of the contents of the file to be scanned will be missed, resulting in incomplete scan information. If a plurality of documents are fed at the same time during photocopying, the problem of paper jam is very likely to occur and the electronic device is interrupted. At present, detecting multiple sheets of paper is when the document passes through the paper feed path, and the document is touched by a foot or a sensing arm, and then the thickness is changed. When the amount of thickness change exceeds a predetermined range, it is determined that a plurality of sheets have been fed. However, this detection method not only has low sensitivity, slow sensing speed, but also easily causes paper jam problems. SUMMARY OF THE INVENTION The present invention relates to a paper feeding device for detecting multiple sheets of paper feeding and a method for detecting the same, which is to install a plurality of groups of emitters in a paper feeding device and 6 200844030

Place the 'receiver' and let it at least measure the effect.

Not parallel to the first transmission path. The invention further provides a method for detecting a plurality of sheets, the method comprising: firstly, transmitting a first signal using a first transmitter, the first signal traveling along the first transmission path, and transmitting using a second transmitter a second signal, the second signal traveling along a second transmission path that is not parallel to the first transmission path; then, receiving the first signal by using the first receiver, and receiving the second signal by using the second receiver; The signal change amount of each signal and the second signal determines whether multiple sheets are fed. In order to make the above-mentioned contents of the present invention more comprehensible, a preferred embodiment will be described below in detail with reference to the accompanying drawings, which are described below as follows: [Embodiment] This embodiment proposes a paper feeding device and its detection. The method of measuring multiple sheets of paper, the paper feeding device can detect the components in the device, and can detect 7.200844030

—· TW3490PA In the paper feeding reduction 砰 “The problem of the smart device. Please refer to Figure 1 for the paper feeding at the same time. The schematic diagram of the % eight feeding device. According to a preferred embodiment of the present invention, the paper includes Paper feeding mechanism (not (4)), as shown in the drawing, the paper feeding device conveys paper to 1G to make the paper along the lG and paper (4) devices. It is used to transport the paper through the ... transmission path, the paper feeding mechanism emits The first detection device includes a first 18 and a control unit 20. The hairdresser is in a hairy state 16, and the second receiver is in the first-emission path P1, =:, 12 The signal is received by the first receiver 14 along the 5^ sub. The first-figure 16 and the second receiving test machine sigh the side of the brother, the Chu-drink, and the other two pairs placed on the pick-up channel 10 - launch The signal of the benefit 16 is followed by a second transmission path and then received by the second receiver 18. The basin t is non-parallel to the first-transmitting path ^ to transmit a control system. Preferably, the transmitter and receiver are disposed. At the same time, the transmission path of a transmitter and a receiver is perpendicular to the transport path of the paper. In the example, the first emitter 12 and the first emitter 14 of the first receiver 14 are perpendicular to the transport path of the sheets 100, 200. The second emitter 16 and the second receiver 18 are obliquely disposed on the paper feed. On the channel 1 ,, the second transmission path P2 and the first transmission path P1 are sandwiched by an angle θ. The first transmitter 12 and the second transmitter 16 are two ultrasonic emitters, the first receiver 14 and The second receiver 18 is two ultrasonic receivers. The ultrasonic wave transmitted by the first transmitter 12 and the second transmitter 16

TW3490PA 200844030 The two malfunctioning muscles are received by the first receiver 14 and the second receiver 18 after penetrating the paper. The penetration rate of the ultrasonic wave is related to the characteristics of the material to be penetrated. Therefore, it is possible to determine whether or not a plurality of paper feed problems occur by measuring the signal change of the ultrasonic wave after the penetrating material f. In addition, because the super-wave: the amount of attenuation depends on the thickness of the penetrating substance, the wave can be used to detect different types of paper under a specific weight range. However, the interface of the paper overlaps the phase of the ultrasonic wave, so the ultrasonic wave is used to detect whether there is more than one paper feed. The paper feeding mechanism of the sheet feeding device 1 feeds the sheets one by one into the sheet feeding path 10. However, as shown in FIG. 1, when the sheet 1〇〇 and the sheet 200 are simultaneously fed into the sheet feeding path 10, the first receiver 14, the second emitter 16, and the second receiver are provided by the first emitter & and the operation of the control unit 20, it is possible to detect a plurality of sheet feeding conditions of the sheet feeding device 1. The following figures illustrate two different detection methods. Please refer to Fig. 2 for the first flow chart of the multi-feed method for the paper feeding device of Fig. 1 . Please refer to the figures 3A to 3B, which is a schematic diagram of the paper feeding device of Fig. 1 at the time of detection. As shown in the figure, the paper feeding device 1 detects a plurality of paper feeds including steps 21 to 23. First, the first transmitter 12 transmits the first signal, and the second transmitter 16 transmits the second signal. The second signal travels along a second transmission path P2 that is not parallel to the first transmission path P1; then, the first receiver 14 and the first receiver 18 receive the transmission 12 and the first transmission 16 respectively. The message is sent to the control element 2 0; then, the unit 20 is changed according to the signal change of the first signal and the signal of the second signal.

200844030 The amount of m · TW3490PA is changed to determine whether multiple sheets have been fed. In step 2, when the paper is fed into the paper feeding device 1, the driving circuit (not shown) inside the control unit 20 drives the first transmitting benefit 12 and the first transmitting device 16 to have the same or different transmission frequencies. Ultrasonic signal (第_崎_二信号号). In this implementation, the frequency of the first signal is the same as the frequency of the second signal. As shown in Fig. 3A, the first signal transmitted by the first emitter 12 penetrates only the paper (10), and the second signal emitted by the first emitter 16 penetrates the paper. As mentioned above, 'the second signal will change phase due to the interface between the paper and the paper, and u ^ is the same frequency as the second signal, but the signal received by the first receiver and the second receiver is Differences. Moreover, because the second transmitter and the second receiving test are more powerful, the difference is more obvious. Receiving the tilt design of the benefit 18, the difference between the signal first receiver 14 and the second 10 people ΑπΜϋ, g2π%, one 8 9 converts the received signal knife into the second signal and the fourth signal And transmitting as shown in step 23, the control unit (10) will be different from the first signal of the third signal and the phase signal of the first signal. 'The original k money counts the second thief = 4 and ^ four The signal and the judgment unit in the unit 20 (there is no difference between the control and the control read and read) to enter the two-digit offset: two papers are simultaneously fed into the paper feeding device j. In addition, if the first emitter 12 and the first signal are both penetrating through the papers i(9) and 2GG, -Λ: 16 is also transmitted between the penetrating substance and the penetrating substance, and the wave penetration rate can be The penetration rate of 唬 is judged. 200844030

Two consecutive faces π · rW3490PA Two brothers in the first picture: paper 100 and 2. . The size of the air gap between the two is - the transmission crying 19 path P1 is perpendicular to the paper transport path, and the first wave penetration rate is related to D2 (D2 = D1/cose). Such a system of sheep 2G receives the fourth signal from the first receiver 14 and the second receiver, which is inevitably similar to being absorbed by the ultrasonic wave: the second signal and the second signal have an attenuation amount d1 and 2, because the first transmitter 16 and the second receiver 18 are tilted, the amount of attenuation is different. In the case of Li Xi Zhang Jin 2, it will lead to the existence of air gap between the papers, so that the two 曰 ^ produces ^ salty. And the second transmitter 16 and the second receiver 18 are tilted so that the attenuation amount of the §fl is occupied by the second signal and the second signal is controlled by the control unit 20, so that the multi-intensity can be effectively measured. paper. I \ The above method is based on the ultrasonic signal with the same transmission frequency for the continuous measurement. However, it can also be operated by the super-wave with different transmission frequencies and the ultrasonic signal with the higher frequency is the same. The same degree of drought - sheet paper, the higher the degree of attenuation. In other words, the higher the frequency, the more sensitive the ultrasound is to thick or thin «Zhang Yue, so you can adjust the ultrasonic signal frequency to increase the acuity of 1 o'clock. Referring to Figure 4, the second flow chart of the paper feeding device of the first drawing is shown in Fig. 1. As shown in FIG. 4, the paper feeding device i detects a plurality of paper feeds. The method includes steps 41 to 43: first, the first emitter 12 is caused to emit the first signal along the first-transmitting path pi at the first time. I receives the signal from the first receiver 14, and transmits the signal to the control unit 11

rW3490PA 200844030 20; Next, causing the second transmitter μ to transmit the second signal along the second transmission path P2 that is not parallel to the first transmission path P1 at the second time, and receive the signal by the second receiver 18, and then transmit the signal To the control unit 20; then, the control unit 20 determines whether a plurality of paper feeds have occurred according to the signal change amount of the first signal and the signal change amount of the second signal. The difference from the method of steps 21 to 23 is that the first transmitter 12 and the second transmitter 16 transmit ultrasonic signals at different times, but the signal changes of the first signal and the second signal (such as phase) are measured. There is no difference between the method of changing the aging and the annihilation. Therefore, it is also effective to detect whether multiple sheets are fed. Although this embodiment only uses two sets of transmitters and receivers for description, in fact, more than two sets of transmitters and receivers can be used for detection, as long as at least one set of transmitters and receivers are tilted. And when the weight of the paper on the paper feed path 10 is 50 gsm (gram per square meter) 炱 120 gSm, the signal frequency transmitted by the first transmitter 12 and the second transmitter 16 is greater than 40 kHz, or preferably About 200 kHz to 300 kHz, it has been very good at the time of detection. The paper feeding device 1 can be applied to an electronic device such as a general scanner, a photocopier or a multifunction printer for feeding a scanned document or a blank photocopy paper into the electronic device one by one. If a plurality of sheets of paper are simultaneously fed into the electronic device in the sheet feeding device, the paper jam is easily caused by the excessive thickness of the sheet, and the operation of the electronic device is interrupted. When the paper feeding device 1 having the detecting function is installed in the electronic device, the aforementioned problems can be effectively avoided. For example, when multiple sheets are detected, the processing method is: 12 .200844030

The second series a/ί * TW3490PA (1) The electronic 2 will separate the operation, directly output the overlapping paper to the paper exit, and the multi-feed message will be displayed on the control panel or screen of the pen display. (2) The buns (such as the sweeper) will continue to operate, but only the file on the top layer and the near-image capture area will be scanned. After the scan, the same will be displayed on the control panel or screen. Zhang Jinzhi's message. The paper feeding device disclosed in the above embodiment of the present invention and the method for detecting C multiple feedings are provided in the paper feeding device with two or more sets of ultrasonic transmitters and receivers, which make at least one group The position of the right b of the transmitter and receiver is inclined with respect to the plane of the paper being conveyed. These ultrasonic transmitters can transmit signals of the same or different frequencies and can transmit signals at the same time or at different times. The ultrasonic transmitter and receiver are used in conjunction with the tilt to detect whether the paper overlaps, so that the detection effect is improved. In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. 13 200844030

The second embodiment of the fW3490PA is a schematic view of a paper feeding device in accordance with a preferred embodiment of the present invention. Fig. 2 is a first flow chart showing the method of detecting a plurality of sheets in the sheet feeding device of Fig. 1. 3A to 3B are schematic views showing the paper feeding device of Fig. 1 at the time of detection. Fig. 4 is a second flow chart showing the method of detecting a plurality of sheets in the sheet feeding device of Fig. 1. [Main component symbol description] 1 : paper feeding device 10 : paper feed path 12 : first transmitter 14 : first receiver 16 : second transmitter, 18 : second receiver 20 : control unit 100, 200 : paper P1: first transmission path P2: second transmission path

Claims (1)

2〇〇844030TW349〇pa X. Patent application scope: 1. A paper feeding device comprising: a paper feeding passage for moving a paper along a conveying path; a paper feeding mechanism for conveying the paper through the a paper passing device; a paper detecting device disposed in the paper feeding path, the paper detecting device comprising: a first transmitter for transmitting a first signal, the first signal being along a first emission The path is forwarded; #·' a first receiver for receiving the first signal; % ' . a second transmitter for transmitting a second signal, the first signal traveling along a second transmission path And a second receiver for receiving the second signal; wherein the second transmission path is not parallel to the first transmission path. 2. The paper feeding device of claim 1, wherein the first emission path is perpendicular to the transmission path. /, 3. The paper feeding device of claim 1, wherein the first emitter and the second emitter are simultaneously or not simultaneously emitting the first signal and the first Second signal. In the paper feeding device of the above-mentioned patent application, the signal transmitted by the first transmitter and the second transmitter is the same or different.糸为相相·················································· The frequency of the signal transmitted by one of the transmitters is a coating of a kilohertz. 4〇15 200844030 三达号: TW3490PA 6. The paper feeding device of claim 5, wherein at least the first emitter and the The signal frequency emitted by one of the transmitters of the second transmitter is between 200 kHz and 3 kHz. 7. The paper feeding device of claim 2, wherein the first emitter is The second transmitter is a two-sonic transmitter. The first receiver is a two-sound receiver with the second receiver. 8. The paper feeding device according to the scope of the patent application, The paper_device further includes a judging unit electrically connected to the first receiver and the second receiver for receiving the first signal and the second receiving 11 received by the first receiver Second signal, each signal change Whether or not a plurality of sheets are fed. For example, the paper feed described in the 'i patent of the patent scope, wherein the first-transmitter and the first-receiver, and the two sides of the second paper feed path, and The method of "singing in the 10. two kinds of multiple sheets, respectively: - the third shot - the road launch - the first signal, the first signal is not parallel to the first along the use of a second shot 51 - Transmitting ^ The second signal is connected along the use-receiver: 4 - one = travel; =; the receiver receives the second signal μ and according to the first apostrophe and whether the break is multi-feed. Dimensions of each other, change amount judgment 200844030 one delivery / i lung m · TW3490PA, 11. The method of claim 10, wherein the signal variation is the attenuation of the signal amplitude. 12. The method of claim 10, wherein the signal variation is an offset of the signal phase. 13. The method of claim 10, wherein the first transmitter and the second transmitter respectively transmit the first signal and the second signal at the same time or at different times. 14. The method of claim 10, wherein the signal frequency of the f-th transmitter and the second transmitter is the same or different. 15. The method of claim 10, wherein when the weight of the paper is from 50 g/m2 to 120 g/m2, at least the signal frequency of the first emitter and one of the second emitters is transmitted. More than 40 kHz. 16. The method of claim 15, wherein at least the signal frequency emitted by the first transmitter and the second transmitter is between 200 kHz and 300 kHz. 17. The method of claim 10, wherein the first transmitter and the second transmitter are two ultrasonic transmitters, and the first receiver and the second receiver are two Ultrasonic receivers. The method of claim 10, wherein the paper detecting device further comprises a determining unit electrically connected to the first receiver and the second receiver, according to the first receiver The received signal change amount of the first signal received by the second signal and the second signal received by the second receiver determines whether multiple sheets are fed. 17